关键词: 桩基础, 地铁隧道, 有限元计算, 相互影响, 地铁保护区

Abstract: The installation of piles in subway protection areas has the characteristics of concealed construction, and the significant disturbance to the underground space. Therefore, the interaction between the pile foundation and adjacent subway tunnels is significant and complex. Understanding this interaction is of great significance to the safety of subways and adjacent buildings. A pile installation project near a subway tunnel in Shenzhen case history is presented in this project. A threedimensional numerical model is established using finite element analysis software to analyze the effects of the pile installation, building loading on the tunnel, and tunnel construction on the pile performance of this project. Results indicate that if the tunnel structure is constructed first, the impact of pile installation and building loading on the tunnel is mainly due to the vertical deformation of the tunnel rock mass and the soil caused by the additional stress; If the piles the building are constructed first, the subsequent tunnel construction stress unloading and possible groundwater level drop will cause the vertical deformation of the pile and the building. The vertical deformation mainly occurs during the groundwater drop stage; After the analysis, the impact of the pile and the adjacent subway tunnel construction on each other is within the allowable range of different stake holder and design specifications. However, the real-time monitoring during the construction has a great importance to the safety during the construction and operation.

Key words: Pile Foundation, Subway Tunnel, Finite Element Analysis, Interact, Subway Protection Area